World War I Fast Facts

(CNN)Here's some background information about World War I, also known as the First World War and the Great War, which lasted from 1914 to 1918.

Causes of World War I

The assassination of Archduke Franz Ferdinand of Austria-Hungary by Gavrilo Princip, a Bosnian Serb, led to Austria-Hungary declaring war on Serbia.
    The Central Powers consisted of Austria-Hungary, Bulgaria, Germany and the Ottoman Empire (now Turkey).
      The Allied Powers consisted of Belgium, France, Great Britain, Greece, Italy, Montenegro, Portugal, Romania, Russia, Serbia and the United States.
      The United States declared neutrality until German submarine warfare threatened American commercial shipping.

      US Troop Statistics

      (Source: Defense Casualty Analysis System)
      Battle deaths: 53,402
      Non-battle deaths: 63,114
      Total deaths: 116,516
      Total US soldiers wounded: 204,002
      Total number of US troops that served in the conflict: 4,734,991